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https://github.com/RGBCube/serenity
synced 2025-07-24 13:57:35 +00:00
183205d51c
Instead of PDE's and PTE's being weird wrappers around dword*, just have MemoryManager::ensure_pte() return a PageDirectoryEntry&, which in turn has a PageTableEntry* entries(). I've been trying to understand how things ended up this way, and I suspect it was because I inadvertently invoked the PageDirectoryEntry copy ctor in the original work on this, which must have made me very confused.. Anyways, now things are a bit saner and we can move forward towards a better future, etc. :^)
31 lines
1.1 KiB
C++
31 lines
1.1 KiB
C++
#pragma once
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#include <AK/HashMap.h>
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#include <AK/RefPtr.h>
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#include <AK/RefCounted.h>
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#include <Kernel/VM/PhysicalPage.h>
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#include <Kernel/VM/RangeAllocator.h>
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class PageDirectory : public RefCounted<PageDirectory> {
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friend class MemoryManager;
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public:
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static NonnullRefPtr<PageDirectory> create_for_userspace(const RangeAllocator* parent_range_allocator = nullptr) { return adopt(*new PageDirectory(parent_range_allocator)); }
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static NonnullRefPtr<PageDirectory> create_at_fixed_address(PhysicalAddress paddr) { return adopt(*new PageDirectory(paddr)); }
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~PageDirectory();
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dword cr3() const { return m_directory_page->paddr().get(); }
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PageDirectoryEntry* entries() { return reinterpret_cast<PageDirectoryEntry*>(cr3()); }
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void flush(VirtualAddress);
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RangeAllocator& range_allocator() { return m_range_allocator; }
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private:
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explicit PageDirectory(const RangeAllocator* parent_range_allocator);
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explicit PageDirectory(PhysicalAddress);
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RangeAllocator m_range_allocator;
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RefPtr<PhysicalPage> m_directory_page;
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HashMap<unsigned, RefPtr<PhysicalPage>> m_physical_pages;
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};
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